The difference between a theory and a hypothesis is that a:
A) theory must be supported by evidence.
B) hypothesis must be supported by evidence.
C) theory must be proven beyond a shadow of a doubt.
D) hypothesis must be proven beyond a shadow of a doubt.
Answer: A
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You believe that you have isolated a new strain of positive-sense, single-stranded RNA virus and set about studying it in your laboratory. Which of the following lines of evidence would most strongly support your hypothesis that the virus is a [+]ssRNA?
A) The virions are diploid. B) You sequence the bases in the viral RNA and the mRNA and find them to be antiparallel. C) Introducing a protease inhibitor causes the virus to stop producing proteins and reproducing. D) Introducing a reverse transcriptase inhibitor slows down the growth of the virus.
Which of the following clusters of terms accurately describes DNA as it is generally viewed to exist in prokaryotes and eukaryotes?
A) double-stranded, parallel, (A + T)/(C + G) = variable, (A + G)/(C + T) = 1.0 B) double-stranded, parallel, (A + T)/(C + G) = 1.0, (A + G)/(C + T) = 1.0 C) double-stranded, antiparallel, (A + T)/(C + G) = variable, (A + G)/(C + T) = variable D) double-stranded, antiparallel, (A + T)/(C + G) = variable, (A + G)/(C+ T) = 1.0 E) single-stranded, antiparallel, (A + T)/(C + G) = 1.0, (A + G)/(C + T) = 1.0
Which type of proteins is embedded in the cell membrane in both active transport and facilitated transport?
A. cytoskeletal B. structural C. targeted D. carrier
Which of the following is correct about the evolutionary relationships among the three domains?
A. Archaea and bacteria are more closely related to each other than to eukaryotes. B. Archaea and eukaryotes are more closely related to each other than to bacteria. C. Eukaryotes and bacteria are more closely related to each other than to archaea. D. They are equally distant from each other.